Single vs. Double Piston Rings

I have decided to try and replace my seized Husqvarna 353. I have been looking at Stihl, Husqvarna, Dolmar and Echo. The Husqvarna and Dolmar have single piston ring setups and the Stihl and Echo have double piston ring setups. I have bought a lot of weedeaters, blowers, etc and always look for double piston rings. What's the deal with Husky and Dolmar not using them? Would you expect to get less life out of them as compared to the Stihl or Echo?

With a stock saw, I hope you'll never see revs up that high, considering that 10k seems to be the highest for peak power. Unless one likes to hold the throttle WO for a bit before entering cut. (Like some on YT vids.)

Two rings are better than one. I have a Homelite 2000 that blew out the top ring land but, because it had a second ring, it kept running. Ran a very long time judging from the carbon build up on the bottom side ot the top ring.

Make your single ring Husky, J-Red do that...........................................

Two rings are better than one. I have a Homelite 2000 that blew out the top ring land but kept running/cutting because the second ring held compression. Ran a long time judging from the carbon build up on the bottom side of the top ring.

Do that with your single ring Hoooskeyvarna, J-Red ad nausium.........................

I have a 625 J red that i put an older model j red double ring piston in,not the thin ring,This saw has just as much power as my 266xp and it has a brand new piston and ring in it,Actually I think the 625 has more grunt.

What I have been lead to believe is that a single ring will get more cooling effect from it's journey towards the bottom of the stroke than if there was another ring below it. Maybe it is a choice cooler ring use one more heat transfer away from the piston two rings. The balance idea of two staggered ring ends is interesting. A ring of course needs a port free path for the ends which means two such lands for two ring pistons.